# math

Which equation is NOT an example of a direct variation?
a. y = x b. 4x + 3y = 0 c. y = 5/4 x d. 2x + 6y = 0

Direct variation is y = kx

The only one that can't be changed to become this is d.

Is that correct?

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1. d. y= -(1/3) x direct variation
So, on c. If it is this: y=(5/4) x it is direct, if it is y=5/(4x), it is not direct.
It appears to me at first glance, all are direct variations, check to see if you copied them correctly. 3x-5y=50 is not a direct variation, because y=-(3/5)x-50 Was b or d of this form?

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bobpursley
2. Which equation is NOT an example of a direct variation?
a. y = x b. 4x + 3y = 0 c. y = 5/4 x d. 2x + 6y = 0

Direct variation is y = kx

The only one that can't be changed to become this is d.

D should be 2x + 6x = 20 -- that one is NOT direct variation due to the = 20 = the others ARE direct variation -- is that correct?

Sorry, you are correct, I missed the 20

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3. Which equation is NOT an example of a direct variation?
-7 5
a.y=--------x+1 b.y=------x c.y=4x d.y=-9x
3 16

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